Barrel Worm Tool Grading for Internal Gear Precision
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Solution Overview
Problem
Conventional barrel worm-shaped tools used for grinding internal gears experience uneven load distribution and partial wear due to premature contact at the end portions, leading to irregular grinding and reduced precision.
Innovation Solution
A barrel worm-shaped tool with a gradually increasing diameter and decreasing edge thickness and height from the middle to the end portions, allowing even contact and meshing across the entire axial direction, reducing machining load and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the barrel worm-shaped tool has uniform edge shapes along the axial direction, then the tool structure is simple and easy to manufacture, but the end portions contact the internal gear prematurely causing uneven load distribution and partial wear
Solution Approach 1:
The patent applies local quality by making the edge shapes of the barrel worm-shaped tool non-uniform along the axial direction. Specifically, the edge shapes at the end portions are designed to be smaller than those at the middle portion, creating localized variations in geometry. This ensures that the middle portion contacts the internal gear first during grinding, distributing the load evenly and preventing premature contact and partial wear at the end portions, thereby improving grinding precision.
2Reliability
If the edge shapes at end portions are made smaller to prevent premature contact, then even load distribution is achieved, but the tool design becomes more complex
Solution Approach 1:
The patent implements local quality by varying the edge shape dimensions at different axial positions. The edge shapes at the end portions are deliberately made smaller compared to the middle portion, creating a graduated geometry. This localized modification ensures reliable even load distribution during grinding while maintaining a relatively simple overall tool structure that can be manufactured using conventional methods.
3Productivity
If the barrel worm-shaped tool contacts the internal gear at all portions simultaneously, then grinding efficiency is improved, but the end portions experience excessive wear due to premature contact
Solution Approach 1:
The patent applies local quality by designing different edge shape sizes at different axial positions of the barrel worm-shaped tool. The end portions have smaller edge shapes that contact the internal gear later in the grinding process, while the middle portion has larger edge shapes that contact first. This graduated design ensures all portions contribute to grinding (maintaining efficiency) while preventing excessive wear at the end portions, thereby extending tool service life.
Data Source
AI summary
To provide a barrel worm-shaped tool capable of grinding processing in high precision, while maintaining the reduction of heavy load during the processing and partial wear. For this purpose, a barrel worm-shaped tool that is used in the gear machining of an internal gear (11) is formed with its diameter gradually increasing from the two end portions in the axial direction thereof towards the middle portion thereof. The barrel worm-shaped tool (12) is formed so that edge shapes (31) of the grinding wheel (12) becomes gradually smaller from the edge shape (31) located in the middle portion, in the axial direction of the barrel worm-shaped tool (12) towards the edge shape (31) located in the two end portions, in the axial direction, of the barrel worm-shaped tool (12) in accordance with the amount of machining allowance for the internal gear (11).